Information disclosure in Siyuan-Note Siyuan
CVE-2026-85174
SiYuan before v3.8.2 logs API tokens from query parameters in plaintext to an accessible log file when full-text search requests exceed timing thresholds. Authenticated attackers can read the log file via the getFile endpoint to recover admin API tokens and gain permanent administrative access.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/siyuan-note/siyuan/security/advisories/GHSA-3wvc-5754-gp67 (vendor-advisory)
- www.vulncheck.com/advisories/siyuan-before-3.8.2-api-token-exposure-via-log-file (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85174?
- CVE-2026-85174 is a high-severity vulnerability in Siyuan-Note Siyuan, classified under Insertion of Sensitive Information into Log File. CVSS score: 8.8/10. Published 2026-09-03.
- How severe is CVE-2026-85174?
- High severity. CVSS v3 base score is 8.8 out of 10.